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ISL6121
Using the ISL6121EVAL1 Platform
General and Biasing Information
The ISL6121EVAL1 platform, Figure 17, allows evaluation of
the ISL6121 power supply control IC and comparison
against a suitably sized (1.85A hold current rating) PPTC
component. The evaluation platform is biased and monitored
through numerous test points (TP#). See Table 1 for test
point assignments and descriptions.
TABLE 1. ISL6121EVAL1 TEST POINT ASSIGNMENTS
By enabling the ISL6121H switches by signaling TP4 high
(> 2.4V) the IC is also loaded with a nominal 1.5A current.
Provided test points enable the evaluation of voltage loss
across the PPTC (TP9 - TP10) and likewise across the
ISL6121 enabled switch (TP9 - TP6). Expect to see 10% -
30% greater voltage loss across the PPTC than the
ISL6121.
An Overcurrent (OC) condition can be invoked on both the
ISL6121 and the PPTC by driving TP11 to +6V, causing
SW1 to close and a nominal 3A load is imposed on each.
TP #
TP1
TP2
TP4
TP5
TP6
TP9
TP10
TP11
DESCRIPTION
Eval Board and IC GND
Eval Board +5V Bias
Enable
Fault
VOUT
IC VIN Pin
PPTC Load Side
Invoke Over Current
This represents a current overload to the ISL6121 and is
thus quickly current regulated to the 2A limit. If the OC
duration extends beyond the nominal 12ms of the internal
ISL6121 timer then the output is latched off and the fault
output is asserted by being pulled low, turning on the
FAULT_ LED.
The primary function of any OC protection device is to
quickly isolate the voltage bus from a faulty load. Unlike the
PPTC and some other vendor available IC products, the
ISL6121 internal timer that starts upon OC detection
provides consistent protection that is independent of
temperature. Figures 14 through 16 illustrate the
Upon proper bias the PPTC, F1, has a nominal 1.5A load
current passing through it which is the below the hold current
rating for that particular device. Removal of the PPTC is
necessary to isolate the ISL6121 as the PPTC load current
is common to the ISL6121EVAL1 bias connections.
VIN = 5.07V
comparative efficiency and effectiveness of the ISL6121 vs
the PPTC in protecting and isolating a faulty load capable
from drooping the system bus in that system.
PPTC VOUT
ISL6121 VOUT = 5V
ISL6121 VOUT
PPTC VOUT = 4.96V
12ms OC LATCH-OFF TIME
VOUT (100mV/DIV.)
VOUT (1V/DIV.)
TIME (2ms/DIV.)
FIGURE 14. ISL6121 vs PPTC INTO 3.3 ? LOAD
7
FIGURE 15. ISL6121 vs PPTC INTO 1.6 ? LOAD
FN9004.2
November 12, 2004
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相关代理商/技术参数
ISL6121HEVAL1 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Single Supply Integrated Current Limiting Controller
ISL6121HIB 功能描述:IC CTRLR POWER SUPPLY SGL 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR)
ISL6121HIB-T 功能描述:IC CTRLR POWER SUPPLY SGL 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR)
ISL6121HIBZA 功能描述:IC SUPPLY/CURR LIMIT CTRLR 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR)
ISL6121HIBZA-T 功能描述:IC SUPPLY/CURR LIMIT CTRLR 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR)
ISL6121LIB 功能描述:IC CTRLR POWER SUPPLY SGL 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR)
ISL6121LIB-T 功能描述:IC SUPPLY/CURR LIMIT CTRLR 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR)
ISL6121LIBZA 功能描述:IC SUPPLY/CURR LIMIT CTRLR 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR)